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The arthmetic mean of the numbers 1,...

The arthmetic mean of the numbers
`1,3,3^(2), … ,3^(n-1),` is

A

`(3^(n-1)-1)/2`

B

`(3^(n)-1)/(2n)`

C

`(3^(n+1)-1)/2`

D

`(3^(n)-3)/2`

Text Solution

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The correct Answer is:
B
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